diff --git a/lib/Alchemy/Phrasea/Application/Api.php b/lib/Alchemy/Phrasea/Application/Api.php
index 06160932b9..55c33d3cd3 100644
--- a/lib/Alchemy/Phrasea/Application/Api.php
+++ b/lib/Alchemy/Phrasea/Application/Api.php
@@ -66,4 +66,4 @@ return call_user_func(function ($environment = PhraseaApplication::ENV_PROD) {
     $app['dispatcher']->dispatch(PhraseaEvents::API_LOAD_END, new ApiLoadEndEvent());
 
     return $app;
-}, isset($environment) ? $environment : null);
+}, isset($environment) ? $environment : PhraseaApplication::ENV_PROD);
diff --git a/lib/Alchemy/Phrasea/Application/Root.php b/lib/Alchemy/Phrasea/Application/Root.php
index 2a973fc148..e6470185d9 100644
--- a/lib/Alchemy/Phrasea/Application/Root.php
+++ b/lib/Alchemy/Phrasea/Application/Root.php
@@ -68,4 +68,4 @@ return call_user_func(function ($environment = PhraseaApplication::ENV_PROD) {
     );
 
     return $app;
-}, isset($environment) ? $environment : null);
+}, isset($environment) ? $environment : PhraseaApplication::ENV_PROD);
diff --git a/www/api.php b/www/api.php
index 7033a9e1d7..7e76061a4d 100644
--- a/www/api.php
+++ b/www/api.php
@@ -9,12 +9,14 @@
  * file that was distributed with this source code.
  */
 
+use Alchemy\Phrasea\Application;
 use Symfony\Component\Debug\ErrorHandler;
 
 require_once __DIR__ . '/../lib/autoload.php';
 
 ErrorHandler::register();
 
+$environment = Application::ENV_PROD;
 $app = require __DIR__ . '/../lib/Alchemy/Phrasea/Application/Api.php';
 
 $app->run();
diff --git a/www/index.php b/www/index.php
index 924a601ef3..f7c746c5c8 100644
--- a/www/index.php
+++ b/www/index.php
@@ -9,13 +9,14 @@
  * file that was distributed with this source code.
  */
 
+use Alchemy\Phrasea\Application;
 use Symfony\Component\Debug\ErrorHandler;
 
 require_once __DIR__ . "/../lib/autoload.php";
 
 ErrorHandler::register();
 
-$environment = 'prod';
+$environment = Application::ENV_PROD;
 $app = require __DIR__ . '/../lib/Alchemy/Phrasea/Application/Root.php';
 
 $app->run();
diff --git a/www/index_dev.php b/www/index_dev.php
index 27ee07a78a..dc1472cf9a 100644
--- a/www/index_dev.php
+++ b/www/index_dev.php
@@ -9,13 +9,14 @@
  * file that was distributed with this source code.
  */
 
+use Alchemy\Phrasea\Application;
 use Symfony\Component\Debug\ErrorHandler;
 
 require_once __DIR__ . "/../lib/autoload.php";
 
 ErrorHandler::register();
 
-$environment = 'dev';
+$environment = Application::ENV_DEV;
 $app = require __DIR__ . '/../lib/Alchemy/Phrasea/Application/Root.php';
 
 $app->run();